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/*
* Copyright (c) 2017 BayLibre, SAS.
* Author: Jerome Brunet <jbrunet@baylibre.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
* The full GNU General Public License is included in this distribution
* in the file called COPYING.
*/
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <sound/soc.h>
#define DRV_NAME "simple-amplifier"
struct simple_amp {
struct gpio_desc *gpiod_enable;
};
static int drv_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *control, int event)
{
struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
struct simple_amp *priv = snd_soc_component_get_drvdata(c);
int val;
switch (event) {
case SND_SOC_DAPM_POST_PMU:
val = 1;
break;
case SND_SOC_DAPM_PRE_PMD:
val = 0;
break;
default:
WARN(1, "Unexpected event");
return -EINVAL;
}
gpiod_set_value_cansleep(priv->gpiod_enable, val);
return 0;
}
static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("INL"),
SND_SOC_DAPM_INPUT("INR"),
SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event,
(SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)),
SND_SOC_DAPM_OUTPUT("OUTL"),
SND_SOC_DAPM_OUTPUT("OUTR"),
};
static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = {
{ "DRV", NULL, "INL" },
{ "DRV", NULL, "INR" },
{ "OUTL", NULL, "DRV" },
{ "OUTR", NULL, "DRV" },
};
static const struct snd_soc_component_driver simple_amp_component_driver = {
.dapm_widgets = simple_amp_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(simple_amp_dapm_widgets),
.dapm_routes = simple_amp_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(simple_amp_dapm_routes),
};
static int simple_amp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct simple_amp *priv;
int err;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (priv == NULL)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
priv->gpiod_enable = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(priv->gpiod_enable)) {
err = PTR_ERR(priv->gpiod_enable);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get 'enable' gpio: %d", err);
return err;
}
return devm_snd_soc_register_component(dev,
&simple_amp_component_driver,
NULL, 0);
}
#ifdef CONFIG_OF
static const struct of_device_id simple_amp_ids[] = {
{ .compatible = "dioo,dio2125", },
{ .compatible = "simple-audio-amplifier", },
{ }
};
MODULE_DEVICE_TABLE(of, simple_amp_ids);
#endif
static struct platform_driver simple_amp_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(simple_amp_ids),
},
.probe = simple_amp_probe,
};
module_platform_driver(simple_amp_driver);
MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver");
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
MODULE_LICENSE("GPL");
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